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Synthesis, crystal structure and photoluminescence of the salts Cation+ [M(caffeine)Cl]− with Cation+=N n Bu4 +, AsPh4 + and M==Zn(II), Pt(II)

Vogler, Arnd ; Hischa, Birgit ; Stempfhuber, Sabine



Abstract

The salts ((NBu4)-Bu-n)[Zn(caffeine)Cl-3] and (AsPh4) [Pt(caffeine)Cl-3] were prepared and their crystal structures determined by single crystal X-ray diffraction. The free ligand caffeine, as well as the complex anions [M(II)(caffeine)Cl-3](-) with M=Zn and Pt show an absorption spectrum with an intense band at lambda(max) = 275 nm, which is attributed to an IL pi-pi* transition of the caffeine. ...

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